JPS6215672B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method of manufacturing a strip of flexible laminate composite or nonwoven having a strip of material bonded to a network structure, comprising at least one uniaxially oriented shrinkable thermoplastic material. a perforated strip of material is heated in a heating zone to its thermoplastic state, the holes being opened when said thermoplastic material contracts, thereby forming a network structure; and a method for bonding the network structure to a strip of material in a pressure zone using the heat generated during the shrinkage step and still remaining, and the network structure is made of a shrinkable thermoplastic material. Non-woven fabric having at least one strip of material bonded thereto.

Known methods of the type mentioned above (e.g. Swiss patent no.
515109, or U.S. Pat. No. 3,616,152, no.
No. 3769120 or No. 3885074), the network structure is formed by a slit film, a composite, i.e. a non-woven fabric consisting of three layers of material, using two strips of material and a liquid or paste adhesive. They are formed by adhering each other using the network structure. However, in such a method, a significant inward shrinkage appears in the peripheral area of the perforated strip. If the width of the strip material during processing is, for example, 50 cm, the transverse shrinkage of the perforated strip material can reach, for example, 6-8 cm in known methods. convergence and therefore the edge thickness increases, the amount being 0.01-1.5
reaching millimeters. Therefore, when considering the entire working width of a strip, the edges are bonded more strongly than the center, which often results in inadequate adhesion between the edges of the strip. Become. If there are areas of insufficient adhesion, for example if creases are formed in the strip material, the composite will not only have a poor appearance and quality, but will also have less strength. For example, if tearing occurs in the surrounding area, the insufficient adhesion is further aggravated. Another disadvantage due to the strong shrinkage of the edges of the strip material is that outwardly projecting strip sections arise around the material and thus do not adhere to the net structure. Not only is there a great loss of material due to the removal of the non-adhered surrounding areas, but also the width of the strip of material must be made larger than is necessary for the composite, corresponding to the edges to be cut. It becomes necessary to do so. Furthermore, in the known method, creases transverse to the direction of movement of the strip material occur, for example during production, and in particular when one or both of the strip materials have a tendency to shrink, i.e. at the softening or plasticizing temperature of the material. Such a state occurs in a stable case. Since girth shrinkage occurs, especially in the case of poor quality strip materials, known methods are capable of processing such materials to form composites in the desired manner without the drawbacks and undesirable effects mentioned above. cannot be formed.

It is therefore an object of the invention that uniform adhesion of at least one strip of material to the net structure is carried out over the entire width of the strip and that any type of perforated strip or strips can be bonded to each other. It is an object of the present invention to provide a process for producing flexible laminated composites or nonwovens which can be bonded and which does not have the drawbacks of conventional methods.

To achieve the above object, the method described in the introduction comprises guiding a perforated strip of material through the heating zone along a guide path that curves continuously in one direction, and in which the strip of material is thermoplasticized. in said heating zone in a thermoplastic state, said strip material is combined with a strip carrier as a strip carrier consisting of a material that is substantially stable at the plasticizing temperature of said strip material, and said network structure is still in a thermoplastic state. It is adapted to be delivered to the pressure zone together with the strip carrier.

By using a curved guiding path, i.e. by guiding or moving the perforated strip material in a curved manner according to the method of the invention, an auxiliary clamping effect is obtained in the heating zone; This causes the shrinking perforated strip to be held at its edges in position transverse to the direction of shrinkage. Inward shrinkage in the peripheral part, e.g. sliding on the strip carrier transverse to the direction of movement of the perforated strip material, is substantially reduced, if not completely prevented, so that the network structure formed It remains substantially the same, ie its width remains as large as the width of the perforated strip material being fed. flexible laminated composites according to the method of the invention,
In this case, the formed net structure may extend on at least one side with the strip material to the edge of the strip material. The net structure avoids inward shrinkage due to the absence of material convergence around its periphery, thus providing a bond with substantially the same strength over the entire width of the strip of material. Therefore, the composite material called a strip sheet, ie a non-woven fabric, is bonded with uniform strength over the entire working width of the strip material, right up to its edges. The occurrence of creases is substantially reduced, if not completely prevented. It is also no longer necessary to cut out the non-adhered portions at the edges of the strip. That is, the width of the fed strip material can be the same as the width of the perforated strip material,
A composite having the required width is thus formed.

As used in the following description, the term "network structure" refers to any structure that does not have a complete, i.e., continuous surface, and such a structure has at least one pore that is open, i.e., enlarged. It can be obtained, for example, in the form of a net itself, so that it can be adhesively bonded to the strip material without spanning a completely continuous surface.

Owing to the provision of the arcuate guide channel, the perforated strip material is fed through the heating zone under tension so that a biaxial elongation occurs, so that, for example, due to the friction occurring during contraction, the perforated strip material The edges of the material will become sticky. The mesh structure thus assumes a complete, undisturbed shape, for example in the region adjacent to the edges without holes. This is because the edge portion is held in its position by the curvature of the guide passage and cannot move inwardly. Surfaces which are not completely covered can therefore be obtained, for example, according to the invention by point-bonding, ie spot-welding, the strip material to the network structure by means of a heat-sealing operation;
Moreover, such bonding is performed uniformly over the entire surface of the net structure. In order to carry out the auxiliary fastening, the other strip material to be joined can be applied to the free side of the perforated strip material after the thermoplastic state of the perforated strip material has been obtained, but The process of heating the perforated web to a thermoplastic state is therefore not hindered, for example by said other web, and the perforated web can be completely heated on its as yet uncoated side. can. In this way, it is possible, for example, to avoid overheating of the strip carrier and thus to avoid thermal damage. At the plasticizing temperature of the perforated strip material, a substantially stable carrier strip exhibits little shrinkage, so that in one embodiment of the invention the perforated strip material can be guided through the heating zone together with the carrier strip. can. By providing a curved guide channel, for example, the formation of undesired longitudinal folds in the strip carrier is prevented.

In one embodiment of the invention, the perforated strip is guided through the heating zone, for example with a constant curvature, so that a constant tensile force is created in the perforated strip. Said perforated strip is guided through the heating zone so as to have a curvature, for example at an angle to a tangent drawn at the apex of said curvature, in the direction of said tangent or away from said tangent; It is guided at an angle to the tangent, the magnitude of this angle being determined, for example, according to the required magnitude of the curvature for generating the auxiliary clamping force.
The magnitude of said angle is preferably at least 2 degrees, depending, for example, on the perforated strip material and the material used to prevent the formation of longitudinal folds in the carrier strip. The guide channel can have one or more curvatures, ie the curvatures can have the same angle or different angles. If a perforated strip is fed into the heating zone, for example in a tangential direction, and is withdrawn from the heating zone in a direction away from the tangent, this perforated strip is fed under a tensile force. The tensile force can reach a maximum value in the heating zone and then decrease again or, for example, be guided to a shortest distance relative to the heating element and then away from it. Depending on the material used for the perforated strip and/or the carrier strip, the degree of tension and/or heating of the perforated strip can be controlled in a controlled manner.

Perforated strip materials, also referred to as perforated layers, are made of, for example, polyethylene (PE), ethylene vinyl acetate (EVA) or their copolymers, polypropylene (PP), polyamide (PA), polyurethane (PU), polyester (PEST). or other suitable thermoplastic material capable of bonding to the strip material in a thermoplastic state, i.e., at softening or plasticizing temperatures by heat sealing. These materials can be used in the form of films, foils or plates. However, this perforated strip material can also be a perforated non-woven fabric, for example a fiber strip containing shrinkable fibers as described in Swiss Patent No. 515109, or the like. The perforated strip can be perforated, for example with circular holes.
A slit film is preferably used as the bonding film, which slit film has, for example, mutually offset slits, the slits being formed in substantially parallel rows and extending in the direction of tension of the plastic film. is arranged substantially transversely to the direction of contraction corresponding to the direction of contraction. The advantage of this embodiment is that the slit film does not contract inward in the direction of contraction in the bridging portions without slits, and substantially the entire contraction force is used to effectively widen the slits. That is, it is absorbed by the expansion of the slit. Structures with a high degree of uniformity are thus obtained from slit films with mutually offset slits,
This uniformity is particularly important for achieving uniform adhesion to the strip carrier. However, the slits can be arranged in other ways as described in the aforementioned Swiss Patent No. 515109. By using a slit film, the network structure can advantageously be formed with cross points and a ribbon network of small dimensions suitable for perfect adhesion can be obtained.

The strip carrier and/or other strip materials can be, for example, foils of plastic material, woven, knitted, non-woven fabrics, layers of yarn or the like. Two strips of material, woven or non-woven, such as spongy material or a foil or two foils, can be bonded to each other and composites of the required type are described in the aforementioned Swiss Patent No. 515,109. This network structure can be formed using adhesive bonding techniques such as: With this method it is possible to produce mats with textiles on one or both sides, floor coverings such as decorative materials, clothing textiles such as shoe uppers, materials for furniture, insulation materials, etc.

Depending on the material used, the perforated strip may be fed, for example, into a pressure zone following the heating zone, or, after leaving the heating zone, but before reaching the pressure zone, it can be guided through a short unheated zone and the perforated strip may be It may be provided that the web material is maintained in its thermoplastic state.

The method according to the invention is preferably carried out by continuously feeding the strip carrier, the perforated strip material and, for example, other strip materials.

Next, embodiments of the present invention will be described with reference to the accompanying drawings.

In FIG. 1 a perforated strip 2 of shrinkable, at least uniaxially oriented thermoplastic material, for example a slit film as described in Swiss Patent No. 515109, is moved from a reel 1 to a cylinder or It is fed to a roller 3 on which the perforated strip 2 is mounted on a strip carrier 4 which is fed from a reel 5 to the roller 3 . Both the perforated strip 2 and the carrier strip 4 pass through a guide and feed roller 6 and a delivery roller or cylinder 7 driven by a suitable device (not shown) and shown in FIG. Like 1
The grid bars 8, 9,
10 into the scissor plane A, a pressure zone of length D located in said scissor plane A is formed by the pressure roller. Lattice bar 8,
Instead of 9, 10, freely rotating or rotationally driven rollers can be used.

An electric heating device 13 with terminals 14 is provided opposite the sides of the grid bars 8, 9, 10 covered by the slit film 2 and the strip carrier 4, and this heating device is heated in the direction of arrow B. radiates heat. The strip of material 16 is fed from a further reel 15 onto guide and feed rollers 17, 18 and passes under the pressure roller 11 in the same way as the scissor plane A.

The slit film 2, located on the side of the carrier strip 4 facing the heating device, is heated by said heating device 13 over a heating zone of length H until it reaches its thermoplastic state and is thereby shrunk. At the same time, the slits open and a net is formed. The strip material 16 emerging from the heating zone H is applied to the yet uncoated side, ie the side of the mesh, and this mesh is bonded to the strip carrier 4 in the pressure zone D on the one hand and heat-sealed, and on the other hand during the shrinking stage. It is bonded to the strip of material 16 by the heat retained therein, i.e. on both sides thereof. Therefore, the strip carrier 4 and the strip material 16
are interconnected by said net in said pressure zone D to form a composite or non-woven fabric 19, and the non-woven fabric leaving pressure zone D is guided by a guide roller or cylinder 20 and a draw-off roller 21. It passes through the pair and is finally wound onto the reel 22.

In particular, as shown in FIG.
0 are arranged so that their vertical axes 8a, 9a, 10a are on the arc E of the circle, and the axes 8a, 9
The corners of a convex regular polygon (not shown) in which points a and 10a are located are defined. The slit film 2 thus moves continuously along a guide path F curved in one direction, which path is formed by the arrangement of the rods 8, 9, 10 and which is connected to the heating device 13. The slit film 2 is curved so as to have a convex surface, so that the slit film 2
The convexly curved side of the tube is heated. This slit film 2 has each lattice rod 8,
It has the same curvature at 9, 10 and is guided through the heating zone H at an angle α of at least 2 degrees with respect to the tangent T at the apex S of said curvature. Since the guide path F has a radius of curvature, the slit film 2 and the carrier strip 4 are guided directly from the path L indicated by the dotted line in the figure, that is, from the feed roller 7 to the scissor surface, and are subjected to pressure. The slit film 2 and the strip carrier 4 are biased against the passageway entering the area D, thus providing an auxiliary fastening.
becomes subject to a tensile force in the guide channel F and thus in the heating zone H. The slit film 2 enters the heating zone in the direction of the tangent T to the grid bars 8, 9 and is drawn out of the heating zone H in the direction away from the tangent T to the grid bars 9, 10. The tensile force at the apex is maximized. If each angle α in the lattice bars 8 and 9 is 3 degrees, the total angle of curvature at the highest apex S of the lattice bars 9 on the entrance side of the slit film 2 is 6 degrees. Correspondingly, the same angle is formed on the discharge side from the grid bars 9 towards the pressure area D. The slit film 2 is adhered to the strip-shaped carrier 4 by the tensile force, so that even if contraction occurs in a direction transverse to the direction of movement, the edges are prevented from moving.

The components of the device described above are arranged in a frame 23, and the guide and feed rollers 3, 6, 7, 1
7, 18, 20 and reels 1, 5, 15, 22
is rotatable or driven in the direction of the arrow. Similarly, the pairs of rollers 11, 12, 21 are connected to the frame 23.
It is mounted inside the vehicle and is driven in the direction of the arrow shown in the figure.

For bars 9 and 10, therefore, the curved guide path F
In order to provide the required distance to the upper slit film 2, the heating device is operated by means of clamping screws 24 which act in slotted guides 25 in the frame 23 in the direction of the rods 8, 9, 10. It is mounted so as to be slidable and pivotable about the screw 24 as a pivot center.

Instead of arranging the grid bars 8, 9, 10 on the arc E, they can be arranged at the corners of an irregular polygon, so that the curvature of the guide path can be varied as required. Similarly, the highest peak of curvature is heated in area H
Can be placed at other points within. Pressure area D
The slit film 2, together with the carrier strip 4, is passed through the unheated zone U between the heated zone H and the pressure zone D, while maintaining a tension force within the slit film 2 until bonding occurs. The length of this non-heated zone U varies depending on, for example, the type of material and the feeding speed or heating of the slit film 2, and is the length necessary to maintain the thermoplastic state of the material of the slit film until it reaches the pressure zone D. For example, it can be smaller than 50 cm, preferably 25-30 cm. Depending on the type of material and/or the thickness of the carrier strip 4, for example, guide rollers 6, feed rollers 7, grid bars 8, 9, 1
0, the pressure rollers 11, 12, the feed roller 18 and/or the guide roller 20 can be maintained at the required temperature by heating or cooling, so that the strip carrier 4 and/or A thermoplastic state of the slit film is obtained without damaging the strip material 16, so that the required bonding takes place to form the composite 19. In this way, the thermoplastic state is maintained in the required manner until bonding takes place in the pressure zone, and overheating of the slit film 2, the strip carrier 4, the strip material 16 and/or said rollers and rods is avoided. I can do it. It should be noted that instead of the rods 8, 9, 10 it is conceivable to use corresponding curved plates which have holes and are capable of cooling or heating.

For example, a slit film 2 made of EVA copolymer and having a width of 160 cm and a thickness of 50 to 200 microns is used, and the heating temperature on the surface of the slit film is changed to 150 to 200 degrees Celsius. A process can be carried out with a speed of 6 meters per minute.

FIG. 3 also includes the parts shown in FIGS. 1 and 2, but in this case the perforated strip 30 is guided along a curved path F through the heating zone H and The carrier 31 is made of rods 8, 9, 1
the side of the perforated strip 30 facing towards 0, i.e. the rod 10 where the perforated strip is in a thermoplastic state;
passes under this strip of material at . Strip material 3
0 can be of any type with holes that contract when heated to form a network structure, for example a slit film as described in the case of FIGS. 1 and 2. be able to.
In the heating zone H, this perforated strip material 30
It is heated by a gas infrared heater 32 of a heating device 34 . In order to prevent the pressure roller 11 and therefore the web 16 from being overheated, a cooling device 35 is mounted on the frame 23 in the unheated area U, said roller 11 being heated by the radiant heat of the heating device 34. It is designed to prevent it from getting hot.

The preparation of compound 19 is carried out analogously to the example of FIGS. 1 and 2.

As shown in FIG. 4, a carrier strip 37 fed through guide rollers 36 in the direction of arrow G is brought together with a perforated strip 39 on a feed roller 38 driven in the direction of arrow K. The strip of material 39 is fed in the direction of the arrow M and is brought to rest on the side of the strip of carrier 37 facing towards the feed roller 38 after being assembled. Both the strip carrier 37 and the perforated strip material 39 coming out of the feed roller 38 are
It is transferred by a suitable device (not shown) to a heating roller 40 driven in the direction of the arrow N, on which drum the strip carrier 37 is located as the inner layer and the perforated strip 39 is the outer layer. form a layer. When the perforated strip 39 passes around the drum with the strip carrier 37 over an angle β, the surface 4
The heating area is continuously guided in one direction along a curved guide path formed by 1, the length of the path being determined by the magnitude of the angle β. The perforated strip material 39 is heated on the drum 40 through the strip carrier 37 from the concave side of the guide channel 41 until it reaches a thermoplastic state, so that holes are also formed by shrinkage of the perforated strip material 39. A net is formed by this. This mesh in a thermoplastic state is placed immediately next to the heating area.
It is pulled out together with the strip carrier 37 by means of a pair of pressure rollers 42 . The uncoated side of the net is a pressure roller 42
On the inlet side of the pair, it is combined with a strip of material 43, which is fed in the direction of the arrow P, which in the pressure area of the pair of rollers 42 passes through a net, which is still in a thermoplasticized state, onto the carrier strip. are bonded to form a composite or nonwoven fabric 44, which is drawn in the direction of arrow R. The drum 40 has an opening 40a on its surface for supplying high temperature steam for heating.

FIG. 5 shows the strip immediately after the strips 46, 47 have been joined together through the thermoplastic material net 48 and the thermoplastic material has shrunk in the direction of arrow V so that it is inserted between the strips. 45, which can be formed by the process of the present invention, such as the heat sealing process in the pressure zone of FIG. Said net 48 is arranged at its edge 49 in the direction of arrow V, i.e. in its longitudinal direction W (the direction in which the net is fed along a curved path by the process of the invention).
In contrast, it does not undergo significant inward contraction in the lateral direction. The mesh 48 therefore extends close to the edges 50, 51 of the strips 46, 47 transverse to the direction of contraction V. Since the netting 48 has a uniform thickness Z over its entire width C, i.e. on both edges 49 of the netting and in the remaining part 52, this netting has substantially the entire width C on both sides.
The strip material 46, 47 is uniformly distributed over the
is combined with

In FIG. 6, parts already described in the case of FIG. The strip-shaped material 16 in FIGS. 3 to 4 or the strip-shaped material 4 in FIG.
3 can be produced by the process of the present invention without using. This composite 53 consists of a mesh 54 bonded on one side to a strip of material 55 and has the same features as described in the embodiment of FIG. Since the net 54 is glued to the strip material 55 on only one side, this composite 53
can be used, for example, when the uncoated side of the screen 54 is to be applied onto a strip of cloth or the like by heating.

[Brief explanation of the drawing]

FIG. 1 is a schematic cross-sectional view of an apparatus for producing flexible laminated composites; FIG. 2 is an enlarged view of the portion of the apparatus shown in FIG. 1; FIG. 3 is a portion of another embodiment of the apparatus. FIG. 4 is a schematic cross-sectional view of another apparatus for producing a flexible laminated composite; FIG. 5 is a partial schematic cross-sectional view of the flexible laminated composite immediately after bonding; FIG. FIG. 3 is a schematic diagram of another flexible laminated composite immediately after bonding. In the figure, 2 is a perforated strip material, 4 is a strip carrier, 6 is a guide feed roller, 7 is a feed roller,
8, 9, and 10 are grid bars, 13 is a heating device, 16 is a strip-like material, 17, 18 are guide and feed rollers, 19 is a nonwoven fabric, 20 is a guide roller, and 21 is a drawing roller.

Claims (1)

Claims: 1. A strip-shaped flexible laminate composite having at least one strip of material bonded to a network structure, comprising at least one uniaxially oriented shrinkable thermoplastic material with holes. The strip of material is heated in a heating zone to its thermoplastic state, and the structure is formed by shrinkage of the thermoplastic material and opening of the pores, wherein the structure is formed by shrinkage of the thermoplastic material and opening of the pores. In a method of manufacturing a strip of flexible laminate composite in which the heat still remaining during levering is used to bond the structure to the strip of material in a pressure zone, the perforated strip of material is The perforated strip is guided through the heating zone along the convex side of a guide channel which curves continuously in the direction of the heating zone, so that the perforated strip is guided under tension at least before reaching the pressure zone. When combined with a strip of material as a strip carrier consisting of a material which is substantially stable at the softening point, i.e. the plasticization temperature, of the material, and when the perforated strip is still in its thermoplastic state, both said strips are subjected to pressure. A method characterized in that the method is adapted to be delivered to an area. 2. In the method described in claim 1,
A method in which the perforated strip is heated on the convex side of the curved guide channel. 3. In the method described in claim 1,
A method in which the perforated strip is heated on the concave side of the curved guide channel. 4. In the method described in claim 1,
A method in which the perforated strip is guided with a constant curvature. 5. In the method described in claim 1,
A method in which the perforated strip of material is guided through the heating zone so as to have a curvature relative to a tangent drawn at the apex of the curvature. 6. In the method described in claim 5,
A method in which the perforated strip of material is guided in the tangential direction through the heating zone. 7 In the method described in claim 5,
A method in which the perforated strip of material is guided through the heating zone in a direction away from the tangent. 8. In the method described in claim 5,
A method in which the perforated strip of material is guided into the heating zone in the direction of the tangent and removed from the heating zone in the direction away from the tangent. 9. In the method recited in claim 5,
A method in which the perforated strip is guided at an angle of at least 2 degrees to the tangent. 10. The method according to any one of claims 1 to 9, wherein the strip-shaped material and the strip-shaped carrier are both fed through a heating zone in a continuous curved state in one direction. How they are becoming paid. 11. A method as claimed in claim 1, in which, when the network structure is still in its thermoplastic state, another strip of material is applied to its as yet uncoated side, said strip of material being placed in a pressure area. wherein said network structure is attached to a strip-like carrier. 12. A method according to claim 11, wherein said further strip of material is applied immediately in front of said pressure zone. 13. The method of claim 1, wherein the perforated strip is guided over the carrier strip and enters the pressure zone along a continuous curved path. 14. The method of claim 1, wherein the perforated strip and the carrier strip are guided into a pressure zone following the heating zone. 15. A method according to claim 1, wherein the perforated strip is guided over the carrier strip through a non-heated zone before leaving the heating zone and reaching the pressure zone. How to be. 16. A method as claimed in claim 1 or 15, in which the perforated strip is guided along a path offset with respect to the path leading directly from the feeding device to the pressure area. . 17. The method of claim 1, wherein the perforated strip material is a slit film. 18. The method of claim 17, wherein the slit film comprises a plastic foil having substantially parallel slits, the slits being substantially parallel to the direction of contraction of the plastic foil which corresponds to the direction of elongation. in a substantially horizontal manner. 19. The method of claim 18, wherein the slits are offset from each other. 20. The method according to claim 18, wherein the slit film is made of a thermoplastic synthetic resin,
For example, processes adapted to be produced from ethylene vinyl acetate or copolymers thereof, polypropylene, polyamide, polyurethane or polyethylene. 21. A method according to claim 1 or 11, in which the strip material as strip carrier is a fibrous material, such as a non-woven fabric, a woven fabric, a knitted fabric or the like, or a non-fibrous material, such as a plastic foil, How to be spongy plastic or similar. 22 Claim 11 or 21
A method according to paragraph 1, in which the other strip material consists of a fibrous material, such as non-woven, woven, knitted or the like, or a non-fibrous material, such as plastic foil, spongy plastic or the like. 23. A strip-shaped flexible laminate composite having at least one strip of material bonded to a network structure, wherein the perforated strip of material comprises at least one uniaxially oriented shrinkable thermoplastic material in a heating zone. heating to its thermoplastic state, such that the structure is formed by shrinkage of the thermoplastic material and opening of the pores, which occur during the shrinkage stage and remain until this time. an apparatus for feeding the perforated strip material in an apparatus for use in a method for manufacturing a flexible laminated composite material, the structure being adapted to be bonded to the strip material in a pressure zone using heat generated by the perforated material; a device for feeding a strip of material as a strip carrier; a pressure zone arranged next to the device for feeding the perforated strip material in the feed channel for the perforated strip material; and a pressure zone for feeding the perforated strip material; and a heating zone located between the device and the pressurized air, said heating zone H, β
a guide passage F continuously curving in one direction for the perforated strip material 2, 30, 39;
41 is provided. 24. The device according to claim 23, wherein the guide passage F, 41 is offset with respect to the passage L leading directly from the feed device 7, 38 for the perforated strip 2 to the pressure area D. Device. 25. The device according to claim 23, wherein the guide passages F, 41 have the same curvature with respect to the tangent T at the apex of the curvature. 26. The device according to claim 25, wherein the guide passage F, 41 forms an angle α of at least 2 degrees with respect to the tangent T at the highest peak S of curvature.
A device that is curved. 27. In the device according to claim 25, the guide passage F curves toward the heating area H until it reaches the highest peak S, and then curves away from the area. A familiar device. 28. The device according to claim 25, wherein the guide passage F is formed by grid bars 8, 9, 10. 29. In the device according to claim 28, the longitudinal axes 8a, 9 of the lattice bars 8, 9, 10
A device in which a and 10a are placed at the corners of a polygon. 30. The device according to claim 28, wherein the longitudinal axes 8a, 9a, 10a are arranged on an arc E passing through the corners of a regular polygon. 31. The device according to claim 23, wherein the guide passage F is curved in a convex manner with respect to the heating device 13 arranged outside thereof. 32. The device according to claim 23, in which the pressure zone D comprises, for example, a perforated strip 2, 30, 39 and a strip carrier 4, 16, 31,
Pair of pressure cylinders 11,1 pulling 37,43
2,42. 33. In the device according to claim 23, the belt-shaped carriers 14, 16, 31, 37, 43
A device in which a feed device 3, 6, 7, 36, 38 for the heating zone is arranged in front of said heating zone H, β, viewed in its feeding direction. 34. Device according to claim 23, in which the feed device 10 for the carrier strip 31 is located between the feed device 7 for the perforated strip 30 and the pressure zone D. 35. The apparatus of claim 23, wherein the curved guide passage is the outer surface 41 of the drum 40. 36. The apparatus of claim 35, wherein said drum 40 is capable of being heated. 37. The device according to any one of claims 23 to 36, in which a guiding device 11 for the other strip material 16, 43 is provided between the heating zones H, β and the pressure zone D. , 42.